I installed new cords as well and added a ground bolt. Wired up a new switch. The motor just hums. No rotation. I have read about a centrifugal swith that is probably gummed up. How hard are these motors to get apart, and more importantly, back together?
Your Powr-Kraft motor is split phase, so there is no capacitor. It has oil ports on both sides, so it has sleeve bearings... no ball bearings. There is no thermal/overload protection switch. There is no on/off switch. The motor is as basic as it gets and should be relatively easy to take apart.
Be very organized when dismantling. There are likely shim, fiber, rubber or thrust washers on each side. As said above, take many photos of the sequence of how parts are removed.
I recently overhauled a much different Powr-Kraft motor. However, your terminal bar is very similar to mine. I suspect the centrifugal switches may be identical.
Before dismantling, there are a few things you can check first.
- If the motor ran before you added the new cord with ground, take the ground wire out if the equation and test. This can be done without removing the ground screw by adding a 2-prong adapter to the plug. This is not likely the problem, but I once had an issue after adding a ground to a motor.
- Turn on power and spin the pulley by hand. This will bypass the intended purpose of the cent switch/start windings.
Do not let the motor hum for too long. It will overheat and potentially burn out.
- Check the continuity of the centrifugal switch. This can be done using a meter from the outside of the terminal bar. Check this post and several following. Ignore comments that don't apply. I also had a problem with the cent switch.
If it still does not start, you have nothing to lose by opening up the motor. Best case, you'll find the problem. Worst case, it is scrap, but a great learning experience.
